Office chair



FIG. 1 is a front elevational view of an office chair showing the claimed new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a left elevational view thereof;

FIG. 4 is a right elevational view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof;

FIG. 7 is a front perspective view thereof; and,

FIG. 8 is a rear perspective view.

Any broken lines immediately adjacent to the claimed portions are boundaries, all other broken lines are environmental structures; all the broken lines form no part of the claimed design. 

CLAIM The ornamental design for an office chair, as shown and described. 